A sequence of changes that will be undone/redone as a group
Note that passing an IHistory to the merge() method of an IHistory
should be implemented by merging their contained deltas by key, except
for deltas with keys of None, which are simply aggregated in the resulting
history.
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Methods
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__contains__
__iter__
__len__
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__contains__
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__contains__ ( key )
Does this history have a delta keyed as key?
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__iter__
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__iter__ ()
Yield the deltas that comprise the group
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__len__
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__len__ ()
Return the number of deltas in the history
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